Evaluation of oxidation and fatigue damage of retrieved crossfire polyethylene acetabular cups
Evaluation of oxidation and fatigue damage of retrieved crossfire polyethylene acetabular cups
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DOI：
10.2106/jbjs.f.00336
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发表时间：
2007-09-01
影响因子：
5.3
通讯作者：
Van Citters, Douglas W.
中科院分区：
文献类型：
--
作者：
Currier, Barbara H.;Currier, John H.;Van Citters, Douglas W.
背景资料：Crossfire交联聚乙烯的生产方式与其他交联聚乙烯材料不同;采用低于熔融温度的退火工艺，目的是避免机械性能受损。本研究进行评估检索Crossfire髋臼杯，以确定他们是否已经氧化，并在何种程度上氧化可能会影响他们的临床performance.Methods：11髋臼杯收到检索和第十二髋臼杯收到两年后检索超过一段时间的四年。由于聚乙烯磨损或疲劳，未回收任何器械。髋臼杯已在体内放置0.1 - 5.3年。每一个都进行了目视检查，临床疲劳损伤的评级，氧化与使用傅立叶变换红外spectroscopic.Results：杯子表现出不同的氧化与其位置上的杯子：氧化值一般是低的关节面，但超过一个数量级更高的值上的边缘。最大边缘氧化与体内时间显著相关（斯皮尔曼rho = 0.734，p = 0.010）。通过在7个髋臼杯边缘和其中1个髋臼杯的关节面上的薄切片中观察到白色条带，目视识别氧化。7个髋臼杯中有6个还表现出临床疲劳损伤。12个髋臼杯中有8个表现出撞击或脱位的证据。结论：由Crossfire聚乙烯制成的髋臼杯氧化到可测量的程度。聚乙烯机械性能的氧化相关降低足以导致在这些取出的髋臼杯中观察到疲劳损坏。临床相关性：在Crossfire聚乙烯制成的髋臼杯中测量的氧化使其在使用短短三年后容易疲劳。
Background: Crossfire cross-linked polyethylene is produced differently from other cross-linked polyethylene materials; a below-melt-temperature annealing process is used with the goal of avoiding compromised mechanical properties. The present study was performed to evaluate retrieved Crossfire acetabular cups to determine whether they had oxidized and to what extent oxidation might have influenced their clinical performance.Methods: Eleven acetabular cups were received at retrieval and a twelfth acetabular cup was received two years post-retrieval over a period of four years. None were retrieved because of polyethylene wear or fatigue. The cups had been in vivo from 0.1 to 5.3 years. Each was examined visually, clinical fatigue damage was rated, and oxidation was measured with use of Fourier transform infrared spectroscopy.Results: The cups exhibited oxidation that varied with its location on the cup: the oxidation value was generally low on the articular surface but more than an order of magnitude higher value on the rim. Maximum rim oxidation correlated significantly with the time in vivo (Spearman rho = 0.734, p = 0.010). Oxidation was identified visually by a white band in thin sections on the rim of seven of the cups and on the articular surface of one of these seven cups. Six of the seven cups also exhibited clinical fatigue damage. Eight of the twelve cups exhibited evidence of impingement or dislocation.Conclusions: Acetabular cups made of Crossfire polyethylene oxidized to a measurable degree. The oxidation-related reduction of polyethylene mechanical properties was sufficient to allow the fatigue damage seen in these retrieved cups. Clinical Relevance: The oxidation measured in acetabular cups made of Crossfire polyethylene makes them susceptible to fatigue after as little as three years in service.